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Seagate Technology STX

Seagate Technology is the 82nd largest S&P 500 company by market cap, worth $143 billion. 12 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 5 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 11.1% of the company.

CEO
William D. Mosley
Sector
Information Technology
Sub-industry
Technology Hardware, Storage & Peripherals
Headquarters
Dublin, Ireland
Founded
1979
More
Wikipedia
Market cap
$143B
82nd largest, 23 Oct 2026 close
Revenue
$12.2B
Fiscal year 2026
Price to sales
11.7
Market cap over revenue
Employees
30,000
10-K, 3 Jul 2026
Market cap per employee
$4.8M
Market cap over employees
Connections
5
S&P 500 companies sharing a director or officer

Largest institutional holders

Each fund group's share of Seagate Technology. Where a company has several share classes, the share is of its total value.

13F filings for the quarter to 30 Jun 2026

These five hold 29.3% of Seagate Technology.

Source: SEC Form 13F data sets, SEC XBRL shares outstanding 路 All holders

Board and officers

5 people here also hold roles at other S&P 500 companies.

Roles filed up to 30 Sep 2026

NameTitle
Directors (12)
William D. MosleyCEOCEO
Mark AdamsDirectorAlso at Cadence Design SystemsLast filed 28 Oct 2025Director
Shankar ArumugaveluDirectorDirector
Prat BhattDirectorDirector
Judy BrunerDirectorAlso at Applied MaterialsLast filed 21 Oct 2025Director
Michael R. CannonDirectorAlso at Lam ResearchLast filed 28 Oct 2025Director
Richard L. ClemmerDirectorAlso at HPLast filed 28 Oct 2025Director
Yolanda Lee ConyersDirectorDirector
Jay L. GeldmacherDirectorLast filed 2 Feb 2026Director
Dylan G. HaggartDirectorLast filed 28 Oct 2025Director
Thomas A. SzlosekDirectorLast filed 12 Nov 2025Director
Stephanie TileniusDirectorAlso at ZoetisDirector
Officers (5)
Gianluca RomanoEVP & CFOLast filed 16 Sep 2026EVP & CFO
Kian Fatt ChongEVP Global OperationsLast filed 16 Sep 2026EVP Global Operations
James C.I. LeeEVP & CLOLast filed 26 Aug 2026EVP & CLO
John Christopher MorrisEVP & CTOLast filed 22 Sep 2026EVP & CTO
Ban Seng TehEVP & Chief Commercial OfficerLast filed 16 Sep 2026EVP & Chief Commercial Officer

Source: SEC insider filings (Forms 3, 4 and 5), Seagate Technology's Form 4 filings 路 All directors and officers

Companies that share people with Seagate Technology

Each person's title here, then at the other company.

  • Applied Materials AMAT
    • Judy Bruner: Director here, Director there
  • Cadence Design Systems CDNS
    • Mark Adams: Director here, Director there
  • HP HPQ
    • Richard L. Clemmer: Director here, Director there
  • Lam Research LRCX
    • Michael R. Cannon: Director here, Director there
  • Zoetis ZTS
    • Stephanie Tilenius: Director here, Director there

Source: SEC insider filings 路 See the whole network

Seagate Technology's market cap since December 2008

Marked weeks are changes in the share count, such as a merger, not market moves.

Weekly, up to 23 Oct 2026

Show equal percentage changes as equal steps.
201020122014201620182020202220242026$143B

Source: Yahoo Finance closing prices, SEC XBRL shares outstanding

Workforce

Headcount at 3 Jul 2026

Employees
30,000
As of July 3, 2026, we employed approximately 30,000 full-time employees worldwide, including approximately 25,000 employees located in Asia.
Seagate Technology Form 10-K

Source: Seagate Technology Form 10-K

Insider trades

Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.

Trades from 30 Sep 2025 to 30 Sep 2026

Directors and officers sold $572 million of stock in 80 sales and made no open-market purchases in the 12 months to 30 Sep 2026.

DatePersonTitleTypeSharesValue
21 Sep 2026SaleJohn Christopher MorrisEVP & CTOEVP & CTOSale9,354$8.2M
15 Sep 2026SaleWilliam D. MosleyCEOCEOSale97,889$76M
15 Sep 2026SaleBan Seng TehEVP & Chief Commercial OfficerEVP & Chief Commercial OfficerSale52,730$41M
15 Sep 2026SaleGianluca RomanoEVP & CFOEVP & CFOSale49,984$39M
15 Sep 2026SaleJohn Christopher MorrisEVP & CTOEVP & CTOSale15,466$12M
14 Sep 2026SaleWilliam D. MosleyCEOCEOSale1,870$1.5M
14 Sep 2026SaleBan Seng TehEVP & Chief Commercial OfficerEVP & Chief Commercial OfficerSale989$770K
14 Sep 2026SaleGianluca RomanoEVP & CFOEVP & CFOSale955$746K
14 Sep 2026SaleJohn Christopher MorrisEVP & CTOEVP & CTOSale493$385K
11 Sep 2026SaleGianluca RomanoEVP & CFOEVP & CFOSale50,498$42M

Showing 10 of 80 trades

Source: SEC insider transactions data sets, Seagate Technology's Form 4 filings

Trades by members of Congress and officials

Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.

Trades from 20 Oct 2023 to 20 Oct 2026

7 people disclosed 7 purchases and 12 sales of Seagate Technology stock since October 2023.

DateMember or officialTypeAmount
30 Sep 2026Lisa McClain (House, R-MI)House, R-MI 路 SoldSale$15,001 to $50,000$15K to $50K
15 Sep 2026Kevin Hern (House, R-OK)House, R-OK 路 SoldSale$1,001 to $15,000$1K to $15K
27 Apr 2026Donald J Trump (President)President 路 SoldSale$15,001 to $50,000$15K to $50K
13 Apr 2026Rohit Khanna (House, D-CA)House, D-CA 路 BoughtPurchase$1,001 to $15,000$1K to $15K
27 Mar 2026Alan Armstrong (Senate, R-OK)Senate, R-OK 路 BoughtPurchase$1,001 to $15,000$1K to $15K
18 Dec 2025Julie Johnson (House, D-TX)House, D-TX 路 SoldSale$1,001 to $15,000$1K to $15K
13 Nov 2025Julie Johnson (House, D-TX)House, D-TX 路 SoldSale$1,001 to $15,000$1K to $15K
28 Oct 2025Kevin Hern (House, R-OK)House, R-OK 路 SoldSale$15,001 to $50,000$15K to $50K
6 Oct 2025Kevin Hern (House, R-OK)House, R-OK 路 SoldSale$15,001 to $50,000$15K to $50K
8 Sep 2025Lisa McClain (House, R-MI)House, R-MI 路 BoughtPurchase$15,001 to $50,000$15K to $50K

Showing 10 of 19 trades

Source: House, Senate and OGE disclosures via the Congress trading monitor

Not on file: no WARN layoff notices under its own name since October 2023.